MP3373GY

MP3373 8 Strings, Step Up WLED Controller with External Transistor The Future of Analog IC Technology DESCRIPTION FEATURES The MP3373 is a step-up controller with 8channel external current sources designed for driving the WLED arrays for large size LCD panel backlighting applications.   The MP3373 employs peak current mode, fixed frequency architecture to provide robust operation with 9V to 40V input supply. The switching frequency is programmable by an external frequency setting resistor. The MP3373 integrates the constant current control circuit to regulate each LED string current to the programmed value set by an external resistor. And the current matching can achieve 1.2% regulation accuracy between strings. Its low 200mV regulation voltage on LED current sources reduces power loss and improves efficiency. To reduce inrush current and the stress of components, MP3373 employs the phase shift PWM dimming mode which can be disabled by pulling PSEN pin to GND. MP3373 also includes UVLO, LED short/open protection, inductor/diode short protection and thermal shut down protection. All these faults are indicated by the fault flag signal. 9V to 40V Input Voltage Range 8-Channel LED strings with external current balance 1.2% Current Matching Accuracy Between Strings Programmable Switching Frequency External PWM Dimming Selectable Phase Shift Function at PWM DIM Mode Open/Short LED Protection Short Inductor/Diode Protection Programmable Over-voltage Protection Thermal Shutdown Fault Flag Output Extendable LED Channels with Share One Set of Power Stage TSSOP-28 and SOIC-28 Packages            APPLICATIONS   LCD Flat Panel Displays 2D/3D LCD TVs and Monitors All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Products, Quality Assurance page. “MPS” and “The Future of Analog IC Technology” are registered trademarks of Monolithic Power Systems, Inc. The MP3373 is flexible for extending LED channels with two or three ICs in parallel with sharing one power stage. It is available in TSSOP-28 and SOIC-28 packages. MP3373 Rev. 1.02 8/16/2016 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 1 MP3373, 8 STRINGS, WLED CONTROLLER WITH EXTERNAL TRANSISTOR TYPICAL APPLICATION D1 L1 8 WLED Strings VIN CIN COUT R1 1 CVCC 23 CCOMP RCOMP ROSC EN/PWMI DIM PSEN VCC GATE 28 RFF 2 FAULT VIN 3 4 5 6 22 21 20 19 18 17 16 ISENSE FAULT PGND COMP OVP OSC EN/PWM DIM FB8 CTL8 MP3373 CTL1 FB1 CTL2 FB2 FB7 CTL3 CTL7 FB3 FB6 CTL4 CTL6 FB4 FB5 CTL5 27 M1 R2 26 25 R SENSE 24 8 7 RS1 10 9 RS2 12 11 RS3 14 13 RS4 15 RS2 RS3 RS4 MP3373 Rev. 1.02 8/16/2016 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 2 MP3373, 8 STRINGS, WLED CONTROLLER WITH EXTERNAL TRANSISTOR ORDERING INFORMATION Part Number MP3373GY* MP3373GM* Package SOIC-28 TSSOP-28 Top Marking MP3373 MP3373 * For phase shift function, please only order MP3373GY-C755 or MP3373GM-C755 PACKAGE REFERENCE Package Diagram Package Diagram TSSOP-28 SOIC-28 ABSOLUTE MAXIMUM RATINGS (1) VIN ...................................................-0.3V to 42V VGATE ,VCC , VFAULT ...........................-0.3V to 11V VCTL1 to VCTL8 ...................................-0.3V to 55V All Other Pins ...............................-0.3V to +6.3V (2) Continuous Power Dissipation (TA = +25°C) TSSOP-28………………………………...1.56 W SOIC-28……………………………………2.08W Junction Temperature ...............................150C Lead Temperature ....................................260C Storage Temperature............... -65C to +150C Recommended Operating Conditions (3) Supply Voltage VIN ..............................9V to 40V Operating Junction Temp ........ -40°C to +125°C MP3373 Rev. 1.02 8/16/2016 Thermal Resistance (4) θJA θJC TSSOP-28...................... ........ 80 ...... 30... C/W SOIC-28....…......…........ ........ 60 ...... 30... C/W Notes: 1) Exceeding these ratings may damage the device. 2) The maximum allowable power dissipation is a function of the maximum junction temperature TJ (MAX), the junction-toambient thermal resistance θJA, and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by PD (MAX) = (TJ (MAX)-TA)/θJA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. 3) The device is not guaranteed to function outside of its operating conditions. 4) Measured on JESD51-7, 4-layer PCB. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 3 MP3373, 8 STRINGS, WLED CONTROLLER WITH EXTERNAL TRANSISTOR ELECTRICAL CHARACTERISTICS (5) VIN =12V, VEN = 5V, TA = 25°C, unless otherwise noted. Parameters Symbol Condition Operating Input Voltage VIN Supply Current (Quiescent) IQ VIN=12V, VEN=5V, no load with switching Supply Current (Shutdown) IST VEN=0V, VIN=12V LDO Output Voltage VCC VEN=5V,11V